Bondcolor sets bond color independent of the color(s) of the flanking atoms. Individual bond color (see coloring hierarchy) is set and halfbond mode is turned off for each specified bond.
The color_name can be none or any color name that specifies a single color.
~Bondcolor turns halfbond mode on for the specified bonds. This masks individual bond color settings, as each halfbond will be colored to match the flanking atom.
Only bonds with both flanking atoms in atom-spec are affected.
See also: color, bondrepr, bonddisplay, bondzone